在 Python 中接收广播数据包

2022-01-22 00:00:00 python sockets udp broadcast

问题描述

我有以下代码发送一个在子网中广播的 udp 数据包.

I have the following code which sends a udp packet that is broadcasted in the subnet.

from socket import *
s=socket(AF_INET, SOCK_DGRAM)
s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
s.sendto('this is testing',('255.255.255.255',12345))

以下代码用于接收广播包.

The following code is for receiving the broadcast packet.

from socket import *
s=socket(AF_INET, SOCK_DGRAM)
s.bind(('172.30.102.141',12345))
m=s.recvfrom(1024)
print m[0]

问题是它没有收到任何广播数据包.但是，它成功地接收到发送到该端口的正常 udp 数据包.

The problem is that its not receiving any broadcast packet. However, it is successfully receiving normal udp packets sent to that port.

我的机器显然正在接收广播数据包，我使用 netcat 对其进行了测试.

My machine was obviously receiving the broadcast packet, which I tested using netcat. 

$ netcat -lu -p 12345                                             
this is testing^C

那么，问题究竟出在哪里?

So, where exactly is the problem?

解决方案

尝试绑定到默认地址:

s.bind(('',12345))

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